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Animal classification: non-chordates to phyla and chordates to classes: NEET MCQs with answers

126 questions on this topic of Diversity in Living World (NEET 2027 syllabus). Here are 12; tap one to see its answer and explanation.

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easy

1. Which of the following animals is pseudocoelomate and shows sexual dimorphism with females being distinctly longer than males?

  1. Ascaris
  2. Taenia
  3. Hirudinaria
  4. Fasciola
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Answer: (A) Ascaris

Ascaris (roundworm) belongs to the phylum Aschelminthes, whose members possess a pseudocoelom. In Ascaris, the sexes are separate (dioecious), and females are distinctly longer than males with a straight posterior end.

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2. Birds have long bones that are hollow with air cavities. Such bones are called:

  1. Spongy bones
  2. Cartilaginous bones
  3. Compact bones
  4. Pneumatic bones
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Answer: (D) Pneumatic bones

Birds have fully ossified endoskeletons with pneumatic long bones; their digestive tract has additional chambers, the crop and gizzard.

hard

3. Given below are two statements. Statement I: Ctenophores reproduce only by sexual means. Statement II: Ctenophores show metagenesis. Choose the correct answer.

  1. Both Statement I and Statement II are correct
  2. Statement I is correct but Statement II is incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are incorrect
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Answer: (B) Statement I is correct but Statement II is incorrect

Ctenophores reproduce only sexually, with external fertilisation and indirect development. Metagenesis is seen in cnidarians like Obelia.

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4. Which of the following molluscs does NOT possess a rasping organ called radula for feeding?

  1. Pila (Apple snail)
  2. Sepia (Cuttlefish)
  3. Pinctada (Pearl oyster)
  4. Dentalium (Tusk shell)
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Answer: (C) Pinctada (Pearl oyster)

Bivalves (pelecypods) like Pinctada (pearl oyster) are filter feeders and lack a radula. Most other molluscs, such as Pila, Sepia, and Dentalium, possess a chitinous feeding organ called the radula.

easy

5. The pearl oyster is:

  1. Pinctada
  2. Pila
  3. Sepia
  4. Loligo
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Answer: (A) Pinctada

Pinctada is the pearl oyster. Pila is the apple snail, Sepia the cuttlefish and Loligo the squid; all are molluscs.

NCERT Class 11

hard

6. Assertion (A): Echinoderms are bilaterally symmetrical as adults. Reason (R): Echinoderm larvae are bilaterally symmetrical. Choose the correct option.

  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true
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Answer: (D) A is false but R is true

Adult echinoderms are radially symmetrical; only their larvae are bilaterally symmetrical.

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7. Which among the following features is uniquely found in mammals and not shared by any other vertebrate class?

  1. Presence of homeothermy and a four-chambered heart
  2. Presence of 12 pairs of cranial nerves and ossified endoskeleton
  3. Internal fertilisation and vivipary
  4. Presence of muscular diaphragm and mammary glands
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Answer: (D) Presence of muscular diaphragm and mammary glands

The presence of milk-producing glands (mammary glands) and a muscular diaphragm separating the thoracic and abdominal cavities are unique anatomical features characteristic of mammals. Birds also have a 4-chambered heart and homeothermy; vivipary occurs in some reptiles and chondrichthyes.

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8. In amphibians, the alimentary canal, urinary and reproductive tracts open into a common chamber called the:

  1. Cloaca
  2. Spongocoel
  3. Mantle cavity
  4. Gizzard
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Answer: (A) Cloaca

Amphibians have a cloaca; their heart is three-chambered (two auricles, one ventricle) and they respire through gills, lungs and skin.

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9. Spongilla is an example of a:

  1. Sea anemone
  2. Bath sponge
  3. Fresh-water sponge
  4. Comb jelly
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Answer: (C) Fresh-water sponge

Sycon (Scypha), Spongilla (fresh-water sponge) and Euspongia (bath sponge) are poriferans.

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10. Cyclostomes such as Petromyzon (lamprey) are characterised by:

  1. Feathers
  2. A sucking, circular mouth without jaws
  3. Paired fins and jaws
  4. A bony endoskeleton with operculum
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Answer: (B) A sucking, circular mouth without jaws

Cyclostomes have a sucking, circular mouth without jaws. They are ectoparasites on some fishes; marine lampreys migrate to fresh water to spawn and die a few days later.

NCERT Class 11

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11. Which of the following statements is INCORRECT regarding Class Amphibia?

  1. The alimentary canal, urinary and reproductive tracts open into a common cloaca
  2. Fertilisation is typically external and development is indirect
  3. A tympanum represents the ear and eyes have eyelids
  4. Respiration occurs only through lungs and skin in adults
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Answer: (D) Respiration occurs only through lungs and skin in adults

Respiration in amphibians can take place by gills, lungs, and through skin (cutaneous respiration). Saying it occurs 'only through lungs and skin' is incorrect because aquatic forms and larvae breathe through gills, and buccopharyngeal respiration also occurs.

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12. The statement 'all vertebrates are chordates but all chordates are not vertebrates' is true because:

  1. All chordates have a vertebral column
  2. Vertebrates have a vertebral column replacing the notochord in the adult, which urochordates and cephalochordates lack
  3. Vertebrates lack a notochord at every stage
  4. Cephalochordates have a vertebral column
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Answer: (B) Vertebrates have a vertebral column replacing the notochord in the adult, which urochordates and cephalochordates lack

Vertebrates possess a notochord in the embryo, replaced by a cartilaginous or bony vertebral column in the adult.

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